42 
NUMBER OF BOLL WEEVILS SURVIVING THE WINTER WHEN HIBERNATING IN 
SPANISH MOSS 10 FEET ABOVE GROUND. 
BULLETIN 926, U. S. DEPARTMENT OF AGRICULTURE. 
‘ 
The data on the survival of the weevils in cages installed 10 feet 
above ground in trees are presented in Table XX. Only 4.54 per 
cent of the 4,400 weevils installed in the cages in the trees survived 
the winter. The cage installed on November 15, however, gave a 
total emergence of 10.2 per cent. In connection with the dates of the 
beginning of emergence of the hibernated weevils it is interesting to 
note the manner in which the moss held back the weevils, the first 
emergence not occurring before February 26, and the last emergence 
taking place on July 7. 
TABLE XX.—Hibernation record of boll weevils in cages installed in the trees. 
g 5 Num > = 
5 S) Date on| Date on| Dateon| § eae E 2 
Date | ‘38 | Date of| Date of | which | which | which | © g iors) te 
No. 2-5 | emer- | emer- | percent) percent | percent 3 f Pale . jel Se 
2 gence. | gence. | had had had | S™| & a | (ga P 
=> emerged. emerged. emerged.) & e a Se) les B 
Z ow = |e |e | |e 
1918 1919 1919, 1919 1919 1919. |Days 
Sic snicttc Octsed 1, O00 2s eer oe eee oceen ace a eale ie eee 0 0 0 10 0 
Ge ehee: Oct. 15 | 1,000) Mar. 3 | July 1 | Apr. 2| Apr. 9| Apr.14 }106 | 33 | 27 | 60 10} 6.0 
Dekesns Nov. 1 | 1,000} Mar. 6 | July 7 | May 10 | June 2 | June 4 {113 | 20 | 18 | 38 10} 3.8 
py ae ee Nov.15 | 1,000) Mar. 4 | July 5 | Apr. 7 | May 5 | June 2 |112 | 60 | 42 {102 10} 10.2 
Dee Set Dec. 1 400| Feb. 26 | May 20 | Feb.26 | Mar. 8 | May 4 | 83 6 GS) ab Ua) PS 7 
OCA | aes ee 4, 400) AA ORAS eS Seen Senne Sere 414 |119 | 92 |211 50 | aa ee 
AN ata sw Oee tstel) aS teres esesernnol seeasenac | basetocose 82.8} 23.8] 18.4} 42.2) 10) 4.54 
Mae basso aoe L(Y peecseac| caatecnes|eeoSaahcd|ectaceses|ceescuese 113 | 60 | 42 |102 10} 10.2 
Mabry se eee can AOU Sec none et mace Seok a ea eect cienee crepee ae 83 0 0 0 10 0 
SUMMARY OF THE HIBERNATION OF THE BOLL WEEVIL UNDER ALL CONDITIONS, 
WINTER 1918-19. 
Table XXI gives a summary of the hibernation records secured 
at Madison, Fla., during the winter 1918-19. The records show that 
of 13,100 weevils installed in the three sets of hibernation cages at 
different dates during the fall of 1918, only an average of 7.54 per 
cent survived the winter. The highest percentage of survival is 
shown in the cages installed in the woods on the ground. The second 
highest percentage of survival was in cages installed in the open field 
and the lowest percentage of survival in the cages installed 10 feet 
above the ground. It is also noticeable that in every case weevils 
placed in the hibernation cages on November 15 survived in greater 
numbers than those placed in the cages at an earlier or later date. 
It is evident that weevils that become adult right at the time of 
entrance into hibernation are not in as good physical condition to 
go through the winter as weevils that have had time to feed longer 
and thus get their stomach contents in proper condition for entering 
hibernation. The maximum survival by the weevils that were placed 
i 
